If a program’s execution is expected to take a long time, you can start its execution and then log off the system without having to wait for it to finish by using the command

The nohup command will do this. Normal background processing by appending an ampersand (&) will terminate as soon as you log off.

I’d say platform as a service (paas) or application platform as a service (apaas) or platform base service is a category of cloud computing services that provides a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the infrastructure typically associated with developing and launching an app.

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